[TowerTalk] Guy Wire Anchors

[jimlux]

On 4/15/20 4:23 AM, Rob Atkinson wrote:
>> Lots of big towers and telephone poles are safely anchored by screwing something into the ground. I'd venture that very, very few wooden poles, even those giant ones, have any concrete involved at >all, and they have fairly large side loads, both static, and wind driven, from the wires and line equipment.
>>
> 
> It's ridiculous to draw an equivalence between a lattice tower
> properly resting on a pier and pin with a telephone pole, that is
> solid wood, and in the ground 10 feet in a tight hole made with an
> auger.   Wood as a material behaves in a completely different manner
> under stress.    Phone pole guying is usually done to counter the pull
> of power cables at the end of a line or when there's a change in
> direction.  Otherwise wood poles are usually unguyed.  A tower on a
> pin has to be guyed just to remain vertical.   A wood pole won't
> collapse from being sunk into the ground.  A tower will unless it is a
> short stub

I was thinking more of the anchors for the guys and at least for ones 
I've seen recently, they're under quite a bit of tension (at a corner in 
the line, so the line tension is asymmetric.

Yes, the stiffness of the wooden pole in a hole in the ground helps, but 
under constant load (which is the case in most phone poles) they'll lean.

I've not measured the tension on a phone pole guy, but there's not a lot 
of "give" in the guy wire when you lean on it, so the load on that screw 
in anchor is pretty high.

But this goes back to the original comments - a screw in anchor is an 
engineered solution, not a wheelbarrow, shovel, and drawing solution. 
Horses for courses.


> 
> 73
> 
> Rob
> K5UJ
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